McMaster-Carr logo
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    148 Products

    General Purpose Washers

    Your go-to metal washer for every screw size. Washers take the pressure off nuts and screws to protect mounting surfaces.
    Steel
    Image of Product. Front orientation. Washers. General Purpose Washers.
    Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.
    Material Certificate—Washers include a report with a traceable lot number.
    For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.
    For Screw
    Size
    ID
    OD
    Thk.
    For Fastener Strength
    Grade/Class
    Specs. Met
    Certificate Type
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    1/4"
    		0.281"0.625"0.051" to 0.080"SAE Grade 8
    		ASME B18.21.1Material Certificate
    		100000000000000000
    5/16"
    		0.344"0.688"0.051" to 0.080"SAE Grade 8
    		ASME B18.21.1Material Certificate
    		500000000000000
    3/8"
    		0.406"0.812"0.051" to 0.080"SAE Grade 8
    		ASME B18.21.1Material Certificate
    		5000000000000000
    1/2"
    		0.531"1.062"0.074" to 0.121"SAE Grade 8
    		ASME B18.21.1Material Certificate
    		2500000000000000
    5/8"
    		0.656"1.312"0.074" to 0.121"SAE Grade 8
    		ASME B18.21.1Material Certificate
    		100000000000000
    5/8"
    		0.656"1.312"0.122" to 0.146"SAE Grade 8
    		——2500000000000000
    3/4"
    		0.812"1.469"0.108" to 0.160"SAE Grade 8
    		ASME B18.21.1Material Certificate
    		100000000000000
    1 3/4"
    		1.875"3.375"0.178" to 0.196"SAE Grade 8
    		——500000000000000
    2"
    		2.125"3.750"0.178" to 0.196"SAE Grade 8
    		——10000000000000
    2 1/4"
    		2.375"4.750"0.193" to 0.248"SAE Grade 8
    		——100000000000000
    2 1/2"
    		2.625"5.000"0.210" to 0.280"SAE Grade 8
    		——100000000000000
    2 3/4"
    		2.875"5.250"0.228" to 0.320"SAE Grade 8
    		——100000000000000
    3"
    		3.125"5.500"0.249" to 0.327"SAE Grade 8
    		——100000000000000
    M3
    		3.2 mm7.0 mm0.5 mm to 0.6 mmISO Class 10.9
    		DIN 125, ISO 7089—1000000000000000
    M4
    		4.3 mm9.0 mm0.7 mm to 0.9 mmISO Class 10.9
    		DIN 125, ISO 7089—10000000000000000
    M5
    		5.3 mm10.0 mm0.9 mm to 1.1 mmISO Class 10.9
    		DIN 125, ISO 7089—10000000000000000
    M6
    		6.4 mm12.0 mm1.4 mm to 1.8 mmISO Class 10.9
    		DIN 125, ISO 7089—5000000000000000
    M8
    		8.4 mm16.0 mm1.4 mm to 1.8 mmISO Class 10.9
    		DIN 125, ISO 7089—250000000000000
    M10
    		10.5 mm20.0 mm1.8 mm to 2.2 mmISO Class 10.9
    		DIN 125, ISO 7089—2500000000000000
    M12
    		13.0 mm24.0 mm2.3 mm to 2.7 mmISO Class 10.9
    		DIN 125, ISO 7089—100000000000000
    M14
    		15.0 mm28.0 mm2.3 mm to 2.7 mmISO Class 10.9
    		DIN 125, ISO 7089—100000000000000
    M16
    		17.0 mm30.0 mm2.7 mm to 3.3 mmISO Class 10.9
    		DIN 125, ISO 7089—50000000000000
    M18
    		19.0 mm34.0 mm2.7 mm to 3.3 mmISO Class 10.9
    		DIN 125, ISO 7089—50000000000000
    M20
    		21.0 mm37.0 mm2.7 mm to 3.3 mmISO Class 10.9
    		DIN 125, ISO 7089—50000000000000
    M22
    		23.0 mm39.0 mm2.7 mm to 3.3 mmISO Class 10.9
    		DIN 125, ISO 7089—50000000000000
    M24
    		25.0 mm44.0 mm3.7 mm to 4.3 mmISO Class 10.9
    		DIN 125, ISO 7089—10000000000000
    M30
    		31.0 mm56.0 mm3.7 mm to 4.3 mmISO Class 10.9
    		DIN 125, ISO 7089—10000000000000
     

    SAE Washers

    Originally designed for the automotive industry, these washers conform to SAE sizing standards. They generally have smaller diameters than USS washers to fit in cramped spots and are thinner to create more precise gaps. Washers distribute pressure under screws and nuts to protect your mounting surface.
    Steel
    Image of Product. Front orientation. Washers. SAE Washers.
    Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.
    For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.
    For Screw
    Size
    ID
    OD
    Thk.
    For Fastener Strength
    Grade/Class
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    No. 2
    		0.094"0.250"0.016" to 0.025"SAE Grade 8
    		—10000000000000000
    No. 4
    		0.125"0.312"0.028" to 0.036"SAE Grade 8
    		ASME B18.21.11000000000000000
    No. 6
    		0.156"0.375"0.036" to 0.045"SAE Grade 8
    		ASME B18.21.11000000000000000
    No. 8
    		0.188"0.438"0.036" to 0.065"SAE Grade 8
    		ASME B18.21.11000000000000000
    No. 10
    		0.220"0.500"0.036" to 0.065"SAE Grade 8
    		ASME B18.21.11000000000000000
    No. 12
    		0.250"0.562"0.051" to 0.080"SAE Grade 8
    		—5000000000000000
    1/4"
    		0.281"0.625"0.051" to 0.080"SAE Grade 8
    		ASME B18.21.11000000000000000
    5/16"
    		0.344"0.688"0.051" to 0.080"SAE Grade 8
    		ASME B18.21.1500000000000000
    3/8"
    		0.406"0.812"0.051" to 0.080"SAE Grade 8
    		ASME B18.21.1500000000000000
    7/16"
    		0.469"0.922"0.051" to 0.080"SAE Grade 8
    		ASME B18.21.1250000000000000
    1/2"
    		0.531"1.062"0.074" to 0.121"SAE Grade 8
    		ASME B18.21.1250000000000000
    9/16"
    		0.594"1.156"0.074" to 0.121"SAE Grade 8
    		ASME B18.21.1250000000000000
    5/8"
    		0.656"1.312"0.122" to 0.146"SAE Grade 8
    		—2500000000000000
    3/4"
    		0.812"1.469"0.108" to 0.160"SAE Grade 8
    		ASME B18.21.12000000000000000
    7/8"
    		0.938"1.750"0.108" to 0.160"SAE Grade 8
    		ASME B18.21.1100000000000000
    1"
    		1.062"2.000"0.108" to 0.160"SAE Grade 8
    		ASME B18.21.11000000000000000
    1 1/8"
    		1.250"2.250"0.108" to 0.160"SAE Grade 8
    		ASME B18.21.11000000000000000
    1 1/4"
    		1.375"2.500"0.136" to 0.192"SAE Grade 8
    		ASME B18.21.150000000000000
    1 3/8"
    		1.500"2.750"0.136" to 0.192"SAE Grade 8
    		ASME B18.21.1500000000000000
    1 1/2"
    		1.625"3.000"0.136" to 0.192"SAE Grade 8
    		ASME B18.21.1500000000000000
    1 5/8"
    		1.750"3.750"0.153" to 0.213"SAE Grade 8
    		ASME B18.21.110000000000000
    1 3/4"
    		1.875"3.375"0.178" to 0.196"SAE Grade 8
    		—500000000000000
    1 7/8"
    		2.000"4.250"0.153" to 0.213"SAE Grade 8
    		ASME B18.21.110000000000000
    2"
    		2.125"3.750"0.178" to 0.196"SAE Grade 8
    		—10000000000000
     

    Oversized Washers

    These washers have exaggerated diameters to cover large holes and to compensate for uneven mounting surfaces. They are also thicker than general purpose washers, so they bridge wide gaps when used as spacers.
    Steel
    Image of Product. Front orientation. Washers. Oversized Washers.
    Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.
    Material Certificate—Washers include a report with a traceable lot number.
    For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.
    For Screw
    Size
    ID
    OD
    Thk.
    For Fastener Strength
    Grade/Class
    Certificate Type
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    1/4"
    		0.281"0.625"0.090" to 0.108"SAE Grade 8
    		Material Certificate
    		100000000000000000
    1/4"
    		0.285"1.250"0.047" to 0.080"SAE Grade 8
    		—100000000000000
    1/4"
    		0.285"1.500"0.047" to 0.080"SAE Grade 8
    		—100000000000000
    1/4"
    		0.285"2.000"0.047" to 0.080"SAE Grade 8
    		—50000000000000
    5/16"
    		0.344"0.688"0.090" to 0.108"SAE Grade 8
    		Material Certificate
    		5000000000000000
    5/16"
    		0.348"1.000"0.047" to 0.080"SAE Grade 8
    		—250000000000000
    5/16"
    		0.348"1.250"0.047" to 0.080"SAE Grade 8
    		—100000000000000
    5/16"
    		0.348"1.500"0.047" to 0.080"SAE Grade 8
    		—100000000000000
    5/16"
    		0.348"2.000"0.047" to 0.080"SAE Grade 8
    		—50000000000000
    3/8"
    		0.406"0.812"0.110" to 0.126"SAE Grade 8
    		Material Certificate
    		5000000000000000
    3/8"
    		0.410"1.500"0.047" to 0.080"SAE Grade 8
    		—100000000000000
    3/8"
    		0.410"2.000"0.047" to 0.080"SAE Grade 8
    		—50000000000000
    7/16"
    		0.469"0.922"0.110" to 0.126"SAE Grade 8
    		Material Certificate
    		250000000000000
    1/2"
    		0.531"1.062"0.190" to 0.208"SAE Grade 8
    		—2500000000000000
    1/2"
    		0.531"1.500"0.056" to 0.071"SAE Grade 8
    		—100000000000000
    1/2"
    		0.531"3.000"0.085" to 0.101"SAE Grade 8
    		—10000000000000
    1/2"
    		0.535"2.000"0.047" to 0.080"SAE Grade 8
    		—50000000000000
    9/16"
    		0.594"1.172"0.168" to 0.191"SAE Grade 8
    		Material Certificate
    		1000000000000000
    5/8"
    		0.656"1.312"0.206" to 0.229"SAE Grade 8
    		Material Certificate
    		1000000000000000
    5/8"
    		0.688"1.500"0.110" to 0.140"SAE Grade 8
    		—500000000000000
    5/8"
    		0.688"2.000"0.110" to 0.140"SAE Grade 8
    		—10000000000000
    3/4"
    		0.812"1.469"0.206" to 0.229"SAE Grade 8
    		Material Certificate
    		1000000000000000
    7/8"
    		0.938"1.750"0.235" to 0.264"SAE Grade 8
    		Material Certificate
    		50000000000000
    1"
    		1.062"2.000"0.235" to 0.264"SAE Grade 8
    		—50000000000000
    1 1/8"
    		1.188"2.250"0.235" to 0.264"SAE Grade 8
    		—500000000000000
    1 1/4"
    		1.375"2.500"0.235" to 0.264"SAE Grade 8
    		Material Certificate
    		500000000000000
    1 3/8"
    		1.438"2.750"0.235" to 0.264"SAE Grade 8
    		—10000000000000
    1 1/2"
    		1.562"3.000"0.235" to 0.264"SAE Grade 8
    		Material Certificate
    		10000000000000
     

    USS Washers

    These washers meet USS sizing specifications and typically have larger diameters than SAE washers. As a result, they accommodate larger screws and nuts and distribute pressure across a wider surface area. They are also thicker, so they withstand heavier loads and span wider gaps when used as spacers.
    Steel
    Image of Product. Front orientation. Washers. USS Washers.
    Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.
    For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.
    For Screw
    Size
    ID
    OD
    Thk.
    For Fastener Strength
    Grade/Class
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    No. 10
    		0.250"0.562"0.036" to 0.065"SAE Grade 8
    		—100000000000000000
    1/4"
    		0.312"0.734"0.051" to 0.080"SAE Grade 8
    		ASME B18.21.110000000000000000
    5/16"
    		0.375"0.875"0.064" to 0.104"SAE Grade 8
    		ASME B18.21.15000000000000000
    3/8"
    		0.438"1.000"0.064" to 0.104"SAE Grade 8
    		ASME B18.21.15000000000000000
    7/16"
    		0.500"1.250"0.064" to 0.104"SAE Grade 8
    		ASME B18.21.12500000000000000
    1/2"
    		0.562"1.375"0.086" to 0.132"SAE Grade 8
    		ASME B18.21.12500000000000000
    9/16"
    		0.625"1.469"0.086" to 0.132"SAE Grade 8
    		ASME B18.21.12500000000000000
    5/8"
    		0.688"1.750"0.108" to 0.160"SAE Grade 8
    		ASME B18.21.12500000000000000
    3/4"
    		0.812"2.000"0.122" to 0.177"SAE Grade 8
    		ASME B18.21.11000000000000000
    7/8"
    		0.938"2.250"0.136" to 0.192"SAE Grade 8
    		ASME B18.21.11000000000000000
    1"
    		1.062"2.500"0.136" to 0.192"SAE Grade 8
    		ASME B18.21.1500000000000000
    1 1/8"
    		1.250"2.750"0.136" to 0.192"SAE Grade 8
    		ASME B18.21.1500000000000000
    1 1/4"
    		1.375"3.000"0.136" to 0.192"SAE Grade 8
    		ASME B18.21.1500000000000000
    1 3/8"
    		1.500"3.250"0.136" to 0.160"SAE Grade 8
    		ASME B18.21.110000000000000
    1 1/2"
    		1.625"3.500"0.136" to 0.160"SAE Grade 8
    		ASME B18.21.110000000000000
    2"
    		2.125"4.500"0.153" to 0.213"SAE Grade 8
    		ASME B18.21.1100000000000000
    2 1/4"
    		2.375"4.750"0.193" to 0.248"SAE Grade 8
    		—100000000000000
    2 1/2"
    		2.625"5.000"0.210" to 0.280"SAE Grade 8
    		—100000000000000
    2 3/4"
    		2.875"5.250"0.228" to 0.320"SAE Grade 8
    		—100000000000000
    3"
    		3.125"5.500"0.249" to 0.327"SAE Grade 8
    		—100000000000000
     

    Split Lock Washers

    Image of Product. Front orientation. Lock Washers. Split-Lock Washer.
    Stop nuts and screws from loosening due to mild vibration. As you tighten, the uneven ends bite into the nut or screw so it won't back out. While they're not as vibration resistant as other lock washers, they are a great fit for electrical panels, light fixtures, and other light duty assemblies. Split lock washers are not reusable, and they only work with fasteners that have right-hand threads.
    Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.
    For Screw
    Size
    ID
    OD
    Thk.
    For Fastener Strength
    Grade/Class
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    1/4"
    		0.260"0.487"0.062"SAE Grade 8
    		ASME B18.21.110000000000000000
    5/16"
    		0.322"0.583"0.078"SAE Grade 8
    		ASME B18.21.11000000000000000
    3/8"
    		0.385"0.680"0.094"SAE Grade 8
    		ASME B18.21.11000000000000000
    7/16"
    		0.450"0.776"0.109"SAE Grade 8
    		ASME B18.21.110000000000000000
    1/2"
    		0.512"0.869"0.125"SAE Grade 8
    		ASME B18.21.110000000000000000
    9/16"
    		0.574"0.965"0.141"SAE Grade 8
    		ASME B18.21.15000000000000000
    5/8"
    		0.641"1.073"0.156"SAE Grade 8
    		ASME B18.21.15000000000000000
    3/4"
    		0.766"1.265"0.188"SAE Grade 8
    		ASME B18.21.12500000000000000
    7/8"
    		0.894"1.459"0.219"SAE Grade 8
    		ASME B18.21.1100000000000000
    1"
    		1.024"1.656"0.250"SAE Grade 8
    		ASME B18.21.11000000000000000
    1 1/8"
    		1.153"1.903"0.345"SAE Grade 8
    		ASME B18.21.1500000000000000
    1 1/4"
    		1.280"2.104"0.384"SAE Grade 8
    		ASME B18.21.110000000000000
    1 3/8"
    		1.408"2.301"0.422"SAE Grade 8
    		ASME B18.21.110000000000000
    1 1/2"
    		1.534"2.491"0.458"SAE Grade 8
    		ASME B18.21.1100000000000000
    2"
    		2.039"3.144"0.496"SAE Grade 8
    		ASME B18.21.1100000000000000
     

    ASME Washers

    Also known as Type B washers, these meet ASME sizing standards. They take the pressure off screws and nuts to protect your mounting surface.
    Steel
    Image of Product. Front orientation. Washers. ASME Washers.
    Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.
    For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.
    For Screw
    Size
    ASME
    Designation
    ID
    OD
    Thk.
    For Fastener Strength
    Grade/Class
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    No. 8
    		Narrow0.188"0.375"0.036" to 0.045"SAE Grade 8
    		ASME B18.21.1100000000000000000
    No. 10
    		Narrow0.203"0.406"0.036" to 0.045"SAE Grade 8
    		ASME B18.21.110000000000000000
    No. 10
    		Regular0.203"0.562"0.036" to 0.045"SAE Grade 8
    		ASME B18.21.110000000000000000
    1/4"
    		Narrow0.281"0.500"0.056" to 0.071"SAE Grade 8
    		ASME B18.21.15000000000000000
    1/4"
    		Wide0.281"1.000"0.056" to 0.071"SAE Grade 8
    		ASME B18.21.12500000000000000
    5/16"
    		Narrow0.344"0.625"0.056" to 0.071"SAE Grade 8
    		ASME B18.21.1250000000000000
    5/16"
    		Wide0.344"1.125"0.056" to 0.071"SAE Grade 8
    		ASME B18.21.11000000000000000
    3/8"
    		Narrow0.406"0.734"0.056" to 0.071"SAE Grade 8
    		ASME B18.21.12500000000000000
    3/8"
    		Wide0.406"1.250"0.090" to 0.112"SAE Grade 8
    		ASME B18.21.150000000000000
    7/16"
    		Narrow0.469"0.875"0.056" to 0.071"SAE Grade 8
    		ASME B18.21.12500000000000000
    7/16"
    		Regular0.469"1.125"0.056" to 0.071"SAE Grade 8
    		ASME B18.21.11000000000000000
    7/16"
    		Wide0.469"1.469"0.090" to 0.112"SAE Grade 8
    		ASME B18.21.1500000000000000
    1/2"
    		Narrow0.531"1.000"0.056" to 0.071"SAE Grade 8
    		ASME B18.21.12500000000000000
    1/2"
    		Regular0.531"1.250"0.090" to 0.112"SAE Grade 8
    		ASME B18.21.150000000000000
    1/2"
    		Wide0.531"1.750"0.090" to 0.112"SAE Grade 8
    		ASME B18.21.1500000000000000
    5/8"
    		Wide0.656"2.250"0.146" to 0.174"SAE Grade 8
    		ASME B18.21.1100000000000000
    3/4"
    		Narrow0.812"1.375"0.090" to 0.112"SAE Grade 8
    		ASME B18.21.1500000000000000
    3/4"
    		Wide0.812"2.500"0.146" to 0.174"SAE Grade 8
    		ASME B18.21.1100000000000000
    7/8"
    		Narrow0.938"1.469"0.090" to 0.112"SAE Grade 8
    		ASME B18.21.1500000000000000
    1"
    		Narrow1.062"1.750"0.090" to 0.112"SAE Grade 8
    		ASME B18.21.1500000000000000
    1"
    		Wide1.062"3.000"0.146" to 0.174"SAE Grade 8
    		ASME B18.21.1100000000000000
    1 1/8"
    		Narrow1.188"2.000"0.090" to 0.112"SAE Grade 8
    		ASME B18.21.110000000000000
    1 1/4"
    		Narrow1.312"2.250"0.146" to 0.174"SAE Grade 8
    		ASME B18.21.1100000000000000
    1 1/2"
    		Narrow1.562"2.750"0.146" to 0.174"SAE Grade 8
    		ASME B18.21.1100000000000000
    1 3/4"
    		Narrow1.875"3.250"0.146" to 0.174"SAE Grade 8
    		ASME B18.21.1100000000000000
     

    Undersized Washers

    These washers distribute pressure evenly under fasteners with narrow heads, such as cheese and socket head screws. They have smaller diameters than general purpose washers of the same screw size.
    Steel
    Image of Product. Front orientation. Washers. Undersized Washers.
    Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.
    For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.
    For Screw
    Size
    ID,
    mm
    OD,
    mm
    Thk., mm
    For Fastener Strength
    Grade/Class
    Specs.
    Met
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    M4
    		4.38.00.5 to 0.6ISO Class 10.9
    		DIN 433100000000000000000
    M5
    		5.39.00.9 to 1.1ISO Class 10.9
    		DIN 43310000000000000000
    M6
    		6.411.01.4 to 1.8ISO Class 10.9
    		DIN 4335000000000000000
    M8
    		8.415.01.4 to 1.8ISO Class 10.9
    		DIN 433250000000000000
    M10
    		10.518.01.4 to 1.8ISO Class 10.9
    		DIN 433250000000000000
    M12
    		13.020.01.8 to 2.2ISO Class 10.9
    		DIN 4332500000000000000
    M14
    		15.024.02.3 to 2.7ISO Class 10.9
    		DIN 4331000000000000000
    M16
    		17.028.02.3 to 2.7ISO Class 10.9
    		DIN 4331000000000000000
    M20
    		21.034.02.7 to 3.3ISO Class 10.9
    		DIN 433500000000000000
     
    back to top